I used to play Xbox Live before I modded my Xbox, and I had those updates like everyone else. Since I don't play Xbox Live anymore, why should I have those on my Xbox, the reason is because I have to put up with not being able to do that interesting rocket/sword glitch in Halo 2, and whatever else it patched. Thanks, Corn.
My guess would be ftp to xbox and finding the files or redoing your hdd. other then that theres no other way i can think of because they would be on the hdd.